Abstract
Active front steering (AFS) system has been the trend of steering technology in recent years by improving the steering comfort and active safety. In this paper, a new layout AFS system combining column mounted AFS actuator with pinion-type electrical power steering (EPS) system is proposed and its dynamic characteristics are analyzed. Three typical variable gear ratio (VGR) actuators are discussed in detail, including a new VGR actuator proposed. Then, the mathematic dynamics formulas of all main parts of the AFS steering system are induced. With Laplace transform, the block diagram model of each part is introduced. The whole dynamic block model of AFS system is built by combining each part's block systematically. Simulation of the model developed by using PID feedback control is conducted in the environment of Matlab/Simulink to verify the proposed AFS system model.
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